RCA MCR61TF30, Руководство по обслуживанию

Страница: 22 / 48

SERVICE MANUAL
HEF4053 (DS01/DS02)
Triple 2-channel Analog
Multiplexer/Demultiplexer
1. Description
The HEF4053 is a triple 2-channel analog
multiplexer/demultiplexer with a common enable
input (E). Each multiplexer/demultiplexer has two
independent inputs/outputs (Y
0
and Y
1
) a
common input/output (Z) and select inputs (Sn).
Each also contains two-bidirectional analog
switches each with one side connected to an
independent input/output (Y
0
and Y
1
) and the
other side connected to a common
input/output(Z).
With (E) LOW one of the two switches is
selected (low impedance ON-state) by Sn. With
E HIGH all switches are in the high impedance
OFF-state independent of S
A
to S
C
.
V
DD
and V
SS
are the supply voltage connections
for the digital control inputs (S
A
to S
C
and E).
The V
DD
to V
SS
range is 3 to 15V.The analog
inputs/outputs (Y
0
Y
1
and Z) can swing between
V
DD
as a positive limit and V
EE
as a negative
limit. V
DD
-V
EE
may not exceed 15 V.
For operation as a digital multiplexer/demultiple-
xer V
EE
is connected to V
SS
(typically ground).
2. Block Diagrams
Fig. 15 Functional Diagram
20